题目

阅读理解A tornado (龙卷风) is a kind of strong storm with air which moves in a circle quickly. They can move over 200 miles per hour and cause a lot of damage (损坏). As they move across the land, they can easily pick up cars, trucks, and even houses, and then throw them very far. It is important to find a safe place if a tornado gets close. A safe place could be a basement ( 地下室) or the lowest floor.If you are in a home without a basement, try to find a first-floor bathroom ora small room without windows in the middle of your house. You should curl up (蜷缩) into a ball and c17．某学习小组以“伴性遗传的特点”为课题进行调查研究，选择调查的遗传病以及采用正确的方法是（　　）A．白化病、在熟悉的4～10个家庭中调查B．红绿色盲，在患者家系中调查C．血友病、在学校内随机抽样调查D．青少年型糖尿病，在人群中随机抽样调查